Factors governing the fire response of prestressed reactive powder concrete beams

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Yan, Kai
Yang, Jiacheng
Doh, Jeung-Hwan
Zhang, Xin
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2020
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Abstract

This article presents the details of a fire test on eight prestressed reactive powder concrete (RPC) beams cured with 150°C hot air. The test specimens varied in load ratio, cover thickness of tendons, bonded and unbonded tendons, and partial prestressing ratio. The thermal fields, deflection behavior, effective prestress, fire endurance, failure modes, and crack patterns of the beams were observed and recorded, revealing that no obvious fire‐induced spalling occurred on the prestressed RPC beams. The fire test results indicate that the failure of prestressed RPC beams was driven by direct fire exposure and fracture of tendons and longitudinal rebars after generation of wide cracks in the beams. In extreme fire, prestressed RPC beams that were under‐reinforced at ambient temperature may fail as low‐reinforced beams. Fire resistance of the prestressed RPC beams dramatically improved with a decrease of load ratio and increase of cover thickness of tendons. Bonded prestressed RPC beams showed superior performance over equivalent unbonded prestressed RPC beams in fire. The whole‐scale transferring effect of prestress loss in unbonded beams should be considered for fire resistance performance design based on structural systems.

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Structural Concrete

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© 2020 fib. International Federation for Structural Concrete. This is the peer reviewed version of the following article: Factors governing the fire response of prestressed reactive powder concrete beams, Structural Concrete, 2020, which has been published in final form at https://doi.org/10.1002/suco.201900359. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)

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Civil engineering

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Construction & Building Technology

Engineering, Civil

Engineering

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Yan, K; Yang, J; Doh, J-H; Zhang, X, Factors governing the fire response of prestressed reactive powder concrete beams, Structural Concrete, 2020

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